Retirement Benefits - Summary of defined benefit pension plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020		Jun. 30, 2019
Change in plan assets
Fair value of plan assets at beginning of year	$ 4,594,106
Fair value of plan assets at end of year	5,305,577	$ 4,594,106
Amounts recognized on the Consolidated Balance Sheet
Pensions and other postretirement benefits	(1,055,638)	(1,887,414)	[1]
Pension Plan
Change in benefit obligation
Benefit obligation at beginning of year	6,405,623	5,487,574
Service cost	84,188	82,743		$ 76,647
Interest cost	102,475	142,479		160,542
Acquisition	0	380,237
Plan amendments	2,311	3,286
Actuarial (gain) loss	(91,719)	569,306
Benefits paid	(264,062)	(232,048)
Foreign currency translation and other	84,187	(27,954)
Benefit obligation at end of year	6,323,003	6,405,623		5,487,574
Change in plan assets
Fair value of plan assets at beginning of year	4,594,106	4,244,969
Actual gain on plan assets	831,762	253,684
Acquisition	0	280,103
Employer contributions	76,936	72,753
Benefits paid	(264,062)	(232,048)
Foreign currency translation and other	66,835	(25,355)
Fair value of plan assets at end of year	5,305,577	4,594,106		$ 4,244,969
Funded status	(1,017,426)	(1,811,517)
Amounts recognized on the Consolidated Balance Sheet
Other accrued liabilities	(4,944)	(1,423)
Pensions and other postretirement benefits	(1,012,482)	(1,810,094)
Net amount recognized	(1,017,426)	(1,811,517)
Amounts recognized in Accumulated Other Comprehensive (Loss)
Net actuarial loss	1,090,343	1,921,389
Prior service cost	15,006	17,184
Transition obligation	8	26
Net amount recognized	$ 1,105,357	$ 1,938,599

[1] *Year ended June 30, 2020 amounts have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 7 to the Consolidated Financial Statements.